28 incredible skyscrapers of the future

The Kingdom Tower, Saudi Arabia

Funding for the last phase of the $1.2billion (£800million) development , which will be the world's tallest building when it's completed, was secured late in 2015. The 1,000 metre-high Jeddah Tower, as it is also known, will accommodate the world's highest observatory and be a mixed-use building with a gross floor area of 245,000 square metres. This will include offices, a 200-room Four Seasons Hotel, 121 serviced apartments and 360 residential apartments. The tower is expected to be finished by 2020.